US Bridges

I-15 (SR-15) Sbl over Santaquin Canyon Road

Fair

Utah County, Utah · SW Side of Santaquin · Structure no. 3C 763

Built
1989
36 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
94 ft
1 main span
Daily traffic
46,783
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over Santaquin Canyon Road is a steel stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over Santaquin Canyon Road in Utah County, Utah. It was built in 1989, so it is 36 years old, younger than the Utah average of 40.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 46,783 vehicles a day, roughly 23% of them trucks, projected to reach 56,140 by 2043. The structure is 94 ft (28.5 m) long and 45 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-15 (SR-15) Sbl
CrossesSantaquin Canyon Road
LocationSW Side of Santaquin
RouteInterstate 15
CountyUtah County
StateUtah
Coordinates39.96624, -111.7849
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.3 US tons
Inventory rating61.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length94 ft (28.5 m)
Longest span90 ft (27.4 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic46,783 (2023)
Projected traffic56,140 by 2043
Trucks23%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-15 (SR-15) Sbl over Santaquin Canyon Road built?

It was built in 1989, making it 36 years old in 2025.

What condition is I-15 (SR-15) Sbl over Santaquin Canyon Road in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.

How much traffic does I-15 (SR-15) Sbl over Santaquin Canyon Road carry?

About 46,783 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is I-15 (SR-15) Sbl over Santaquin Canyon Road?

The structure is 94 ft (28.5 m) long with a longest span of 90 ft (27.4 m) and a deck 45 ft wide.

Who owns I-15 (SR-15) Sbl over Santaquin Canyon Road?

It is owned by the State Highway Agency.